MQTT newbie troubles

Hello!
I'm trying to run mqtt client on my espruino. And have errors all the time. I tried to do it with options:

function mqttRun(){
  var server = 'my_broker';
  var options = {
          keep_alive: 60,
          port: my_port,
          clean_session: my_port,
          username: "my_user",
          password: "my_pass",
          protocol_name: "MQTT",
          protocol_level: 4,
  };
  var mqtt = require("MQTT").create(server);
  mqtt.connect(options);
  mqtt.on('connected', function() {
    mqtt.subscribe("test");
  });
}

and as result got:

Client connected
Uncaught Error: Function "write" not found!  at line 1 col 35 ....log("Client connected");a.write(b.mqttConnect(b.clie­nt_id))...
                              ^ in function "e" called from line 3 col 353 ..."close")});b.client=a};a?e():a=requir­e("net").connect({host:...
                              ^ in function "connect" called from line 27 col 23   mqtt.connect(options);
                      ^ in function "mqttRun" called from line 1 col 9 mqttRun()

Without options I tried to connect with eclipse sandbox, and it works different:

mqttRun()
["AT+CIPSTART=0,\"TCP\",\"iot.eclipse.or­g\",1883\r\n"
=undefined
Client connected
] "\r\n" <--- "\r\n"
] "OK\r\n" <--- "OK\r\n"
] "\r\n" <--- "\r\n"
] "0, CO" <--- "0, CO"
] "0, CONNEC" <--- "NNEC"
] "0, CONNECT OK\r" <--- "T OK\r"
] "\n" <--- "\n"
] "\r" <--- "\r"
] "\n> " <--- "\n> "
] "\r\n" <--- "\r\n"
] "0, SE" <--- "0, SE"
] "0, SEND O" <--- "ND O"
] "0, SEND OK\r\n" <--- "K\r\n"
] "\r\n+RECEI" <--- "\r\n+RECEI"
["AT+CIPCLOSE=0,1\r\n"
MQTT client disconnected
MQTT client disconnected
Uncaught Error: Unknown Interval
 at line 1 col 62
...ted");clearInterval(b.pintr);b.emit("­disconnected");b.emit("...
                              ^
in function called from system
] "+RECEIVE,0,4:\r\n " <--- "VE,0,4:\r\n "
] "+D,0,3:\x02\x00\x00" <--- "\x02\x00\x00"
] "\r" <--- "\r"
] "\n> " <--- "\n> "
] "\r" <--- "\r"
] "\n0, " <--- "\n0, "
] "0, SEN" <--- "SEN"
] "0, SEND O" <--- "D O"
] "0, SEND OK\r\n" <--- "K\r\n"
] "\r" <--- "\r"
] "\n0, " <--- "\n0, "
] "0, CLO" <--- "CLO"
] "0, CLOSE" <--- "SE"
] "0, CLOSED\r\n" <--- "D\r\n"

Could I fix it somehow?